In a bowl, mix the eggs and sugar well, then add the melted butter, mix, after pouring the milk, mix again, then add the flour, the cocoa, the baking powder, the sifted salt, mix the preparation well, finally add the chocolate chips mix for the last time.

Pour the preparation into the cassettes, put a few pieces of dark chocolate on the muffins.

Preheat the oven to 200 degrees for 5 minutes.
Then lower the temperature to 180 degrees for 15 to 16 minutes.

At the exit of the oven add some chocolates on the muffins (like me), for more delicacy

Test it you will love it.